Dev: 4aae6202

0.2-dev-4aae6202-SNAPSHOT

[tx]

• Nothing-returning queries are now mapped to Unit result.
• Always gather and drain the results of Nothing-returning queries.
  This way such queries won't terminate transaction stream.
• Add imapK for neo4j transforming transactions underlying context.

[cypher]

• Support lifting any Seq and Set value values.
• Syntax for exists expression.
• Better expression support at pattern match.
• Explicitly aliased expressions in continuations of With, Unwind and Call.
• Fix for CypherSyntaxPathOps.
• Fix LiftValue[String].asLiteral.
• Refactor Gather operation.
• Define imapK for Operation.

[apoc]

• Common interface for read and write lock syntax.
• Rename ValidateException => ApocException.